refactor: merge measure + capture_size into one read loop

Both are pure DOM reads, so there's no batching reason to keep them
in separate loops over the destroyed items.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/svelte/src/internal/client/dom/blocks/each.js

@@ -628,9 +628,13 @@ function reconcile(state, array, anchor, flags, get_key) {
 			var controlled_anchor = (flags & EACH_IS_CONTROLLED) !== 0 && length === 0 ? anchor : null;
 
 			if (is_animated) {
-				// Doing all the reads _then_ all the writes minimises layout flushes
-				for (i = 0; i < destroy_length; i += 1) to_destroy[i].nodes?.a?.measure();
-				for (i = 0; i < destroy_length; i += 1) to_destroy[i].nodes?.a?.capture_size();
+				// Doing all the reads _then_ all the writes minimises layout flushes.
+				// `measure` and `capture_size` are both reads, so they share a loop.
+				for (i = 0; i < destroy_length; i += 1) {
+					var am = to_destroy[i].nodes?.a;
+					am?.measure();
+					am?.capture_size();
+				}
 				for (i = 0; i < destroy_length; i += 1) to_destroy[i].nodes?.a?.set_position();
 				for (i = 0; i < destroy_length; i += 1) to_destroy[i].nodes?.a?.set_transform();
 			}